Calculating device.



R. H. PENN.

CALCULATING DEVICE.

APPLICATION FILED APR. 26, 1910.

980,867, Patented Jan. 3, 1911.

INVENTOR MBER! H. FERN, OI SUFIEBN, NEW'YOBX.

cancomrms mwrcn.

I Specification of Letters hunt;

Application iiled April 28, 1910. Serial No. 557,682.

To all whom it may concern:

Be it known that I, Ronnn'r H. Farm, a citizen of the United States, anda resident of Sufi'ern. in the county of Rockland and State of New York,have invented certain new and useful Improvements in CalculatingDevices, of which the following is a specification.

My invention aims to provide certain improvements in calculatingdevices, es ecially those of a circular form in which a'p urality ofannular scales are provided on disks or similar members which are inparallel and contiguous planes, and particularly to that form u n whichLetters Patent No. 922,465, dated ay 25, 1909, were granted to me.

The accompan ing drawings illustrate.

embodiments of t e nvention.

Flgure 1 shows a lan view with clamp in neutral position. ig. 2 shows across section thereof. Fig. 3 shows a cross section of same with clampmoved toward the left and engaging the upper disk. Fig.4 shows.

a cross section of same with clamp moved toward the 'ri ht and engagingthe, lower disk, Fig. 5 s ows a plan view of clamp.

Fig. 6 shows a cross section thereof. Fig. 7 shows an end view of same.I

The scales marked upon the device may be the same or similar to thoseshown in my Letters Patent 922,465, both as to those on the lower opaquedisk A, and as to those on the u per transparent disk B. The two disksthe commoncenter of said scales. In Fig. l the logarithmic scales L andO and the square root scales are on the lower disk, and

the logarithmicscales M and N are on the under surface of the upperdisk.

It is extremely desirable and of great usefulness that either a value ora result obtained on the scales of the upper disk, be-

capable of being transferred to the scales on the lower disk withouthaving to carry this D is mounted on the central pin P between the twodisks A and B, but that it is fixed from motion relatively to the pinonly in a direction transversely to itself. The slot S shown in thecentral portion of the clamp is out exactly so that its sides engage thepin P upper disk where it underlies t tion of the clamp occupies aposition in the and B are also rotatably mounted at wardly and then backon itself until it is.

parallel with the surface of the clamp, so that a space F is leftbetween the clamp and the folded over end. This space at the por-' tionof the clamp near the bend is made so that it is slightly less than thethickness of the u or disk, and after a short distance Patented Jan.3,1911.

throu h the common center of the the 0 ed over end has a slight upwardoiiset, so that the space G is a little greater than the thickness ofthe u per disk. The other end of the clamp is folded downwardly in asimilar manner and relatively to th lower di k. I

In Figs. 1 and 2 the clamp isshown in the neutral position, that is, theortion of the lie folded porspace G which is greater than the thicknessof the disk and can therefore be readily turned without engaging orinterfering wit the clamp, in a simi ar manner the portion of the lowerdisk which overlies the folded portion H of the clamp is free to bemoved without engaging the clamp, and from the aboveit is evident thatas long as the clamp is maintained in this position relatively to thecentral pin and to the disks, it may be rotated about the interferingwith eit tial detail. Fig. 3 shows theclamp ushed toward the centralpin, the slot S in t e clam allowing this to be done, until the upperdis B enters the space F' which is less than the thickness of the diskthis can be done because the material of which the clam is made iselastic and gives sufiiciently to a low the ed of the disk toenter, butis strong and sti enou h in without engaging or to. exert considerablepressure, so that t e clamp is quite securely clamped or wed d to theupperdisk at whatever point may be desired;

Fig. 4 shows the clam pushed in the o posite direction so that t efolded end ongages the lower disk and is held clamped thereto. Thus by asimple push the clamp may be clamped either to the lower or to the upperdisk at any point in itscircumference. I will now explain several usesof this feaer disk; this is an essenture of my invention. Suppose, forexample, it is desired to make a number of different settings in whichone value enters in all, in order to avoid the time wasted and troubleof looking this up on any of the various scales of the lower or upperdisk for each 0 eration, the clamp is rotated until the index ine Eregisters with this value and then the clamp is pushed toward the centerand clamped to either the upper or lower disk as desired, thusmaintaining as long as necessary a mark upon the'value being used.-

In some solutions of various problems, for

' example Fig. 1:

- carrying with it the clamp D until theindex point of contact bein lineE on the clamp re sters with b on the scale 0, the result is then read0115 on the square root scale under the index line K on the upper diskB. Thus it is evident that the clamp can be used to rharka certain ointon the u per disk while said disk is ing rotated a out the central pin,and relativel to the lower disk, and as described above it can be usedto transfer a result on the scales (if 1tghe upper disk to the scales ofthe lower It will be noted that the u per disk has a very slight saucershape with the concavity downward toward the lower disk, the only at thelower ripheral edge of the upperdis and the surifce of the lower disk were it comes in immediate contact with this edge; this line of contacton -the lower disk. being between two of the annular scales, anypossible wearin of the surface will be immaterial, and t us by thisfeature any possible wee of'the scales on the surface of the lower 1 orof those on the under surface of the upper disk is prevented. What Iclaim is:- 1. A calculating device comprising a disk carrying aplurality of annular logarithmic scales, a transparent disk overlyingsame and having itself a plurality of annular logarithmic scales, thescales onone disk registering with those on the'other, said disksrotatably mounted on a pin at .the common center of said scales, and. a

transparent diametral clamp made of a resilient material slightlylonge'rthanQ the .v amp b i provided with a slotin its central portion,

end of said diametral clam over the e ge of the up 'springy materialadapt aso,ee7

the pin which fastens the disks together passing through this slot, saidslot being of such width as to just allow the .pin to be moved in theslot with practically no side to side lost mot-ion; said clamp carryingan index line which coincides with a'diameter of the circle forming theboundary of the outer scale-on the lower disk, and would if continuedpass through the common center of said scales, said slotbeing cutthrough and the clamp body is a little greater than the thickness of theupper disk; the other bein bent downwardly and folded bac para lel toitself with a s ace between it and the folded portion a litt e less thanthe thickness of the lower disk, the end of the foldedportion having adownward ofiset so that the space between it and the clamp is a littlegreater than the thickness of the lower disk.

2; A calculating device comprising in combination a lower disk hav'scales, an upper transparent disk also having scala, a transparentdiametral clamp between said disks provided with a slot in its centralpor- 7 tion, also an index line'coinciding with an imaginar line passingthrough the center a hook sha d bend adapted tolbe clam of said s ot,one end of said clamp haviiroig r disk, the ot er end having a similaradapted to be clamped over the ge of the lower disk; and a pin passingthrou h the center of the two disks so that the sai are rotatablymounted, and also passing through said slot in the central portion ofsaid 0 amp.

3. A calculating device comprising in combination a lower disk having.scales, an upper transparent disk also having scales,

ook sha ed bend disks Y a transparent diametlal clam between said disksprovided with a slot in its central portion, also an-index line coincid"imaginary line through t e center of said slot, one end o 'said'clamphaving a hook shaped bend adapted to be claiitped over the edge of saidupper disk, the er end havin a similar hook shaped bend adapted todieclamped over the'edge of said lower disk; a pin passing throu h thecenter of the two disks so that said isks are rotatably mounted, alsopassing through said slot in the central portion of said clamp, and a cshaped washer underneath and between tlie upperfhead of said pin and theupper surface of 'said a per disk of some ed to keep the faces with anthe lower disk, said up or disk also having scales; a transparentiametral clamp be tween said disk provided with a slot in its centralportion, also an-index line coinciding with an ima inary line passingthrough the center of sai slot, one end of said clamp having a hookshaped bend adapted to be clamped over the edge of the upper disk, andthe other end having a similar hook shaped bend adapted to be clampedover the edge of the lower disk; and a m passing through the center ofthe two disks so that the two disks are rotatably mounted,iand alsopassing through-said slot in the central portion of said clam 5. A.calculiiting device comprising in combination a lower disk, an uppertransparent disk, a transparent clamp between said disks, said clampbeing provided with a slot in its central portion, said clamp alsohaving one hook shaped end adapted to engage the upper disk and theother hook shaped end adapted to engage the lower disk, and a pinpassing through the center of said disks and also through the slot insaid clamp,

Signed at New York in the county of New York and State of New York this23rd day of April A. D. 1910. I

' ROBERT H. FENN. Witnesses C. F. Klnoonn, EDMUND J FENN.

